MLK-25435-1 arm64: dts: imx8mp-evk-basler-ov5640: limit csi clock to 266MHz

commit caa9d96c1406bfccd3266e3cdc300f84d2dda3cd from
git://source.codeaurora.org/external/qoriq/qoriq-components/linux



when dual MIPI CSIs are used, camera clock on each CSI should limit to 266MHz

Signed-off-by: Robby Cai <robby.cai@nxp.com>
Reviewed by: G.n. Zhou <guoniu.zhou@nxp.com>
Signed-off-by: Meng Li <Meng.Li@windriver.com>